Audio mixing

a technology of audio signals and mixing methods, applied in the direction of electrical transducers, special services for subscribers, transducer details, etc., can solve the problems of reducing the signal to noise ratio, reducing the quality, and reducing the complexity of mixing and encoding, so as to avoid the annoying switching behavior in background noise in some situations
US20070274540A1Active Publication Date: 2007-11-29GOOGLE LLC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
GOOGLE LLC
Publication Date
2007-11-29

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Abstract

The invention relates to a method and an apparatus for mixing audio signals. The invention is based on the idea to base selection of what audio channels to mix on the dynamic behaviour of the audio channels in terms of whether they are active or not, rather than basing the selection on quantative measures of the audio channels. According to the invention, a set of audio channels are arranged in a mixing stack and a mixed audio signal is produced from the topmost channels above a predetermined threshold level in the stack. Whenever a channel becomes active, it is placed at the top of the stack.
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Description

TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to a method of mixing audio signals and an audio mixing apparatus designed to operate in accordance with such a method. TECHNICAL BACKGROUND AND PRIOR ART

[0002] In an audio conferencing system, several participants are connected to a conference bridge. The conference bridge will handle admission control of participants, conference control functions etc. When an audio conference is ongoing, the conference bridge performs media processing in order to receive audio signals from the participants, mix the audio signals to a total signal that will be transmitted to the participants (with the exception that its own signal will be subtracted to avoid echo).

[0003] In general, a conferencing system should be scalable, i.e. the hardware that runs the conference bridges should be able to handle several conferences and a great number of participants at the same time. The usual behavior in an audio conference is however that ...

Claims

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